bkchang / equation-evaluator Goto Github PK

This web app supports evaluations of arithmetic expressions.

Python 3

• Flask
  • pip install Flask
• Werkzeug
  • pip install Werkzeug

1. Create a Python 3 virtual environment
2. Install the packages listed above
3. Clone this repository into your local directory
4. Within this repository, execute flask run in the command line
5. Open your browser, and view this web app at your local port http://127.0.0.1:5000

This app support two modes of evaluating arithmetic expressions – direct type-in and file upload.

In the upper part of the app, you will see a textbox, an equal sign, and a submit button. Type your arithmetic expression (e.g. 3*53/2) in the textbox, and press submit. The evaluation result (in this case, 79.2) will pop up on the right hand side of the equal sign. Invalid expressions will result in N/A.

In the bottom part of the app, one can upload a .txt file that lists multiple arithmetic expressions to be evaluated. An example file including 4 expressions is:

1+6
4*9
100.3 - 324.8
4/3

Note that only files with extension of .txt will be accepted. Once the file is selected, press upload. Then a message will be prompted at the bottom like this:

Press here to download a csv file containing the evaluation result, which, if you open it with a common spreadsheet engine, will look like this: